declension vs slope

declension and slope both are nouns.

Word	Noun	Adjective	Verb	Adverb
declension	Yes	No	No	No
slope	Yes	No	Yes	No

As nouns, slope is a hypernym of declension; that is, slope is a word with a broader meaning than declension:

Other hypernyms of declension include incline, side.

declension (noun)	slope (noun)
a class of nouns or pronouns or adjectives in Indo-European languages having the same (or very similar) inflectional forms	the property possessed by a line or surface that departs from the horizontal
a downward slope or bend	an elevated geological formation
process of changing to an inferior state
the inflection of nouns and pronouns and adjectives in Indo-European languages

declension (verb)	slope (verb)
	be at an angle